Cloth feeding flatness detection system of sewing machine

Abstract

The utility model discloses a cloth feeding flatness detection system of a sewing machine, the sewing machine comprises a presser foot, a machine needle, a needle plate and feeding teeth, and the cloth feeding flatness detection system of the sewing machine comprises a first visual sensor, a second visual sensor and a control system; the first visual sensor is arranged above the presser foot thread containing groove, avoids the machine needle and is used for detecting the displacement amount of cloth at the presser foot thread containing groove on the needle plate every time the feeding teeth complete feeding action; the second visual sensor is arranged above the left side or the right side of the presser foot and is used for detecting the displacement of the cloth on the left side or the right side of the presser foot on the needle plate every time the feeding teeth complete feeding action; the first visual sensor and the second visual sensor are both in communication connection with the signal input end of the control system. The cloth feeding flatness detection system of the sewing machine can detect the cloth feeding flatness of the cloth on the needle plate of the sewing machine.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field, concretely relates to a sewing machine cloth feeding flatness detection system. BACKGROUND

[0002] Clothing fabric is up to millions of kinds, especially in the small single fast reaction era, the change of clothes means the change of fabric, and different fabrics need different thread tension to form good stitches, which requires a certain degree of adjustment of the sewing machine. The thread tension after stitch formation, that is, the thread tightness, is an important standard for evaluating stitch quality. When the thread tension is appropriate, the formed stitch is beautiful, the tightness is appropriate, and it has certain stretchability. For example, the trouser legs sewn by flat sewing need to be tightly sewn together, so it is not easy to open the seam. When the thread tension is too loose or too tight, it will form a poor stitch, which may cause the size of the garment to become smaller. Such stitches need to be removed and reworked. Sometimes there are stitches between good and bad stitches, which are generally due to factors such as fabric and thread tension, resulting in tight stitches and slight fabric wrinkles. Compared with flat stitches, poor stitches include twisting, horizontal wrinkles, vertical wrinkles, floating surface threads, floating bottom threads, throwing threads, skipping stitches, misaligned layers, stitch deviation, stitch length inequality, stitch direction inconsistency, stitch skewing, and arching.

[0003] The difference between the stiffness of the entire layer of fibers of the woven fabric in the stitch direction and the thread tension for forming the stitch is called the tensile resistance. For fabrics with good tensile resistance, the stitches on the fabric are not easy to wrinkle. If the fabric has poor tensile resistance and the stitches are tight, it will be difficult to iron flat, wrinkle after washing, and the size will become smaller.

[0004] In order to improve the flatness of the garment, the sewing machine needs to detect the cloth feeding state of the fabric on the needle plate during the process of sewing the fabric with the sewing machine. UTILITY MODEL CONTENTS

[0005] In view of the defects of the prior art, the utility model provides a sewing machine cloth feeding flatness detection system, which can detect the cloth feeding flatness of the fabric on the needle plate of the sewing machine.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A sewing machine feed flatness detection system, the sewing machine comprising a presser foot, a needle, a needle plate and a feed dog, the sewing machine feed flatness detection system comprising a first vision sensor, a second vision sensor and a control system; the first vision sensor is arranged at a position above the presser foot thread groove and away from the needle, for detecting the displacement of the fabric at the presser foot thread groove on the needle plate after each feeding action of the feed dog; the second vision sensor is arranged at a position above the left side or right side of the presser foot, for detecting the displacement of the fabric on the left side or right side of the presser foot on the needle plate after each feeding action of the feed dog; the first vision sensor and the second vision sensor are both in communication connection with the signal input end of the control system.

[0008] Further, a third vision sensor is further included, the third vision sensor is arranged at a position above the front side of the presser foot, for detecting the displacement of the fabric on the front side of the presser foot on the needle plate after each feeding action of the feed dog, wherein the front side of the presser foot is the advancing direction of the fabric; the third vision sensor is in communication connection with the signal input end of the control system.

[0009] Further, the first vision sensor, the second vision sensor and the third vision sensor are all multiple, part of the second vision sensors are arranged at positions above the left side of the presser foot, and the rest of the second vision sensors are arranged at positions above the right side of the presser foot.

[0010] Further, part of the second vision sensors are arranged at positions above the left side of the presser foot with the same distance from front to back, and the rest of the second vision sensors are arranged at positions above the right side of the presser foot with the same distance from front to back.

[0011] Further, the number of the second vision sensors arranged at positions above the left side of the presser foot is equal to the number of the second vision sensors arranged at positions above the right side of the presser foot.

[0012] Further, multiple third vision sensors are arranged at positions above the front side of the presser foot with the same distance from left to right.

[0013] Further, for a lockstitch machine, the first vision sensor, the second vision sensor and the third vision sensor are all arranged at corresponding positions of the lower jaw of the machine head cantilever.

[0014] Further, the first vision sensor, the second vision sensor and the third vision sensor are all arranged at corresponding positions of the bottom of the reverse switch assembly of the lower jaw of the machine head cantilever.

[0015] Further, the communication connection is an electrical connection.

[0016] A sewing machine comprising the above-mentioned sewing machine feed flatness detection system.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] The sewing machine cloth feeding flatness detection system, the first visual sensor, the second visual sensor and the control system, the first visual sensor is arranged at the position above the presser foot thread storage groove and avoids the needle, is used for detecting the displacement of the cloth in the presser foot thread storage groove on the needle plate after each feeding action of the feeding tooth, the second visual sensor is arranged at the position above the left side or the right side of the presser foot, is used for detecting the displacement of the cloth on the left side or the right side of the presser foot on the needle plate after each feeding action of the feeding tooth, and the first visual sensor and the second visual sensor are in communication connection with the signal input end of the control system, so that the first visual sensor can detect the displacement of the cloth in the presser foot thread storage groove on the needle plate after each feeding action of the feeding tooth and send to the control system, the second visual sensor can detect the displacement of the cloth on the left side or the right side of the presser foot on the needle plate after each feeding action of the feeding tooth and send to the control system, the control system compares the displacement of the cloth in the presser foot thread storage groove on the needle plate after each feeding action of the feeding tooth with the displacement of the cloth on the left side or the right side of the presser foot, detects the cloth feeding stretch condition on the needle plate, and further detects the cloth feeding flatness on the needle plate, so that the sewing machine cloth feeding flatness detection system can detect the cloth feeding flatness on the needle plate, so as to make timely adjustment when detecting the cloth feeding stretch condition on the needle plate, thereby facilitating the improvement of the flatness of the garment.

[0019] The utility model discloses a sewing machine cloth feeding flatness detection system, first visual sensor, second visual sensor and control system, first visual sensor is arranged at the position above the presser foot thread storage groove and avoids the needle, is used for detecting the displacement of the cloth in the presser foot thread storage groove on the needle plate after each feeding action of the feeding tooth, second visual sensor is arranged at the position above the left side or the right side of the presser foot, is used for detecting the displacement of the cloth on the left side or the right side of the presser foot on the needle plate after each feeding action of the feeding tooth, and first visual sensor and second visual sensor are in communication connection with the signal input end of control system, so that the first visual sensor can detect the displacement of the cloth in the presser foot thread storage groove on the needle plate after each feeding action of the feeding tooth and send to the control system, the second visual sensor can detect the displacement of the cloth on the left side or the right side of the presser foot on the needle plate after each feeding action of the feeding tooth and send to the control system, the control system compares the displacement of the cloth in the presser foot thread storage groove on the needle plate after each feeding action of the feeding tooth with the displacement of the cloth on the left side or the right side of the presser foot, detects the cloth feeding stretch condition on the needle plate, and further detects the cloth feeding flatness on the needle plate, so that the sewing machine cloth feeding flatness detection system can detect the cloth feeding flatness on the needle plate, so as to make timely adjustment when detecting the cloth feeding stretch condition on the needle plate, thereby facilitating the improvement of the flatness of the garment.

[0020] The first visual sensor, the second visual sensor and the third visual sensor are multiple, part of the second visual sensor is located at the left side upper position of the presser foot, and the rest of the second visual sensor is located at the right side upper position of the presser foot. The control system can make the displacement of the fabric at the presser foot wire groove more accurate by adding and averaging the displacement of the fabric at the presser foot wire groove detected by each first visual sensor, the control system can make the displacement of the fabric at the left side of the presser foot more accurate by adding and averaging the displacement of the fabric at the left side of the presser foot detected by part of the second visual sensor, the control system can make the displacement of the fabric at the right side of the presser foot more accurate by adding and averaging the displacement of the fabric at the right side of the presser foot detected by the rest of the second visual sensor, and the control system can make the displacement of the fabric at the front side of the presser foot more accurate by adding and averaging the displacement of the fabric at the front side of the presser foot detected by each third visual sensor. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic view of a sewing machine including the sewing machine cloth feeding flatness detection system in the utility model;

[0022] Figure 2 It is Figure 1 It is another direction partial enlarged structure schematic view of the hidden needle plate and the components below the needle plate in the utility model;

[0023] Figure 3 It is Figure 1 It is another direction three-dimensional structure schematic view of the utility model;

[0024] Figure 4 It is Figure 3 It is a partial enlarged structure schematic view in the utility model.

[0025] In the drawings, reference signs are explained: 1, presser foot, 101, presser foot wire groove, 2, needle, 3, needle plate, 4, feeding tooth, 5, second visual sensor, 6, third visual sensor, 7, backstitch switch assembly. DETAILED DESCRIPTION

[0026] The specific embodiments of the utility model are further explained in detail in combination with the drawings. These embodiments are only used for explaining the utility model, and are not limited to the utility model.

[0027] In the description of the utility model, it is necessary to explain, the term "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "internal", "external" and so on the direction or position relation indicated is based on the direction or position relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the device or element must have a particular orientation, a particular orientation and operation, therefore it cannot be understood as a limitation on the utility model. In addition, the term "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the utility model, it is necessary to explain, unless otherwise specified and limited, the term "installation", "connection", "connection" should be broad sense, for example, it can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, or indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0029] In addition, in the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more than two.

[0030] A sewing machine cloth feeding flatness detection system, as shown in Figures 1-4 The sewing machine includes presser foot 1, needle 2, needle plate 3 and feeding tooth 4, the sewing machine cloth feeding flatness detection system includes first vision sensor, second vision sensor 5 and control system, the first vision sensor is arranged at the position above the presser foot thread groove 101 and avoids the needle 2, for detecting the displacement amount of the cloth at the presser foot thread groove 101 on the needle plate 3 after each feeding action of the feeding tooth 4, the second vision sensor 5 is arranged at the position above the left side or right side of the presser foot 1, for detecting the displacement amount of the cloth on the left side or right side of the presser foot 1 on the needle plate 3 after each feeding action of the feeding tooth 4, the first vision sensor and the second vision sensor 5 are all in communication connection with the signal input end of the control system.

[0031] Thus, the first visual sensor can detect the displacement of the fabric at the needle plate 3 caused by the feeding tooth 4 after each feeding action and send it to the control system, and the second visual sensor 5 can detect the displacement of the fabric on the left side or the right side of the presser foot 1 of the needle plate 3 caused by the feeding tooth 4 after each feeding action and send it to the control system. The control system compares the displacement of the fabric at the needle plate 3 caused by the feeding tooth 4 after each feeding action with the displacement of the fabric on the left side or the right side of the presser foot 1 to detect the stretching condition of the fabric on the needle plate 3, and further detect the flatness of the fabric on the needle plate 3. Thus, the sewing machine fabric flatness detection system can detect the flatness of the fabric on the needle plate 3, so that the adjustment can be made in time when the fabric on the needle plate 3 is detected to have a stretching condition, thereby improving the flatness of the garment.

[0032] As shown in Figure 1 and Figure 2 the sewing machine fabric flatness detection system further comprises a third visual sensor 6 arranged above the front side of the presser foot 1 to detect the displacement of the fabric on the front side of the presser foot 1 of the needle plate 3 caused by the feeding tooth 4 after each feeding action, wherein the front side of the presser foot 1 is the advancing direction of the fabric; and the third visual sensor 6 is in signal communication with the signal input end of the control system.

[0033] Thus, the third visual sensor 6 can detect the displacement of the fabric on the front side of the presser foot 1 of the needle plate 3 caused by the feeding tooth 4 after each feeding action and send it to the control system. The control system compares the displacement of the fabric at the needle plate 3 caused by the feeding tooth 4 after each feeding action with the displacement of the fabric on the front side of the presser foot 1 to detect the wrinkling condition of the fabric on the needle plate 3, and further detect the flatness of the fabric on the needle plate 3. Thus, the sewing machine fabric flatness detection system can detect the flatness of the fabric on the needle plate 3, so that the adjustment can be made in time when the fabric on the needle plate 3 is detected to have a wrinkling condition, thereby improving the flatness of the garment.

[0034] The utility model discloses, through the first vision sensor detection feeding tooth 4 each complete feeding action needle plate 3 on the displacement amount of the detection technology that the presser foot line groove 101 place cloth occurred belongs to prior art, through the second vision sensor 5 detection feeding tooth 4 each complete feeding action needle plate 3 on the displacement amount of the detection technology that the presser foot 1 left side or right side cloth occurred belongs to prior art, through the third vision sensor 6 detection feeding tooth 4 each complete feeding action needle plate 3 on the displacement amount of the detection technology that the presser foot 1 front side cloth occurred belongs to prior art, the utility model lies in the arrangement position of first vision sensor, second vision sensor 5 and third vision sensor 6 are improved, and through the first vision sensor, second vision sensor 5 and third vision sensor 6 all with the signal input end communication connection of control system, and the control system according to the displacement amount of the cloth that the needle plate 3 corresponding position place occurred, with the cloth of needle plate 3 is detected and sends cloth stretch or cloth wrinkle condition.

[0035] In one embodiment, the first vision sensor, the second vision sensor 5 and the third vision sensor 6 are all multiple, part of the second vision sensor 5 is at the left side of the presser foot 1 above position, the rest of the second vision sensor 5 is at the right side of the presser foot 1 above position, see Figure 1 And Figure 2 .

[0036] In this way, the control system can make the displacement amount of the cloth at the presser foot line groove 101 more accurate by adding and averaging the displacement amount of the cloth at the presser foot line groove 101 detected by each first vision sensor, the control system can make the displacement amount of the cloth on the left side of the presser foot 1 more accurate by adding and averaging the displacement amount of the cloth on the left side of the presser foot 1 detected by part of the second vision sensor 5, the control system can make the displacement amount of the cloth on the right side of the presser foot 1 more accurate by adding and averaging the displacement amount of the cloth on the right side of the presser foot 1 detected by the rest of the second vision sensor 5, and the control system can make the displacement amount of the cloth in front of the presser foot 1 more accurate by adding and averaging the displacement amount of the cloth in front of the presser foot 1 detected by each third vision sensor 6.

[0037] Part of the second vision sensor 5 is arranged at the left side of the presser foot 1 above position at the same distance from front to back, and the rest of the second vision sensor 5 is arranged at the right side of the presser foot 1 above position at the same distance from front to back, see Figure 1 And Figure 2 .

[0038] The number of the second vision sensor 5 arranged at the left side of the presser foot 1 above position is equal to the number of the second vision sensor 5 arranged at the right side of the presser foot 1 above position, see Figure 1 AndFigure 2 .

[0039] Wherein, the plurality of third visual sensors 6 are arranged at the same distance from left to right above the front side of the presser foot 1, see Figure 1 and Figure 2 .

[0040] In one embodiment, for a lockstitch machine, the first visual sensor, the second visual sensor 5 and the third visual sensor 6 are arranged at the respective positions of the lower jaw of the machine head cantilever.

[0041] Preferably, the first visual sensor, the second visual sensor 5 and the third visual sensor 6 are arranged at the respective positions of the bottom of the reverse switch assembly 7 of the lower jaw of the machine head cantilever, see Figure 1 and Figure 2 .

[0042] In one embodiment, the communication connection is an electrical connection.

[0043] A sewing machine comprising the above-mentioned sewing machine feed flatness detection system.

[0044] In summary, in the present utility model, the first visual sensor can detect the displacement of the fabric at the presser foot thread groove 101 on the needle plate 3 after each feeding action of the feeding dog 4 and send it to the control system, the second visual sensor 5 can detect the displacement of the fabric on the left or right side of the presser foot 1 on the needle plate 3 after each feeding action of the feeding dog 4 and send it to the control system, the third visual sensor 6 can detect the displacement of the fabric on the front side of the presser foot 1 on the needle plate 3 after each feeding action of the feeding dog 4 and send it to the control system, the control system compares the displacement of the fabric at the presser foot thread groove 101 on the needle plate 3 after each feeding action of the feeding dog 4 with the displacement of the fabric on the left or right side of the presser foot 1 to detect the feed stretch condition of the fabric on the needle plate 3, the control system compares the displacement of the fabric at the presser foot thread groove 101 on the needle plate 3 after each feeding action of the feeding dog 4 with the displacement of the fabric on the front side of the presser foot 1 to detect the feed wrinkle condition of the fabric on the needle plate 3, through the detected feed stretch or feed wrinkle condition of the fabric on the needle plate 3, the feed flatness of the fabric on the needle plate 3 is detected, therefore, through the present sewing machine feed flatness detection system, the feed flatness of the fabric on the needle plate 3 can be detected, so that adjustments can be made in time when the fabric on the needle plate 3 is in a feed stretch or feed wrinkle state, thereby facilitating the improvement of the flatness of the garment.

[0045] When the sewing machine sews the cloth with elasticity, the cloth pressed by the presser foot 1 can be elongated in the feeding process, which causes the feeding effect to be attenuated. At this time, the displacement of the cloth on the left and right sides of the presser foot 1 which is not pressed by the presser foot 1 is obviously different from the displacement of the cloth at the presser foot accommodating groove 101. After the feeding tooth 4 completes a feeding action, the displacement of the cloth at the presser foot accommodating groove 101 on the needle plate 3 is greater than the displacement of the cloth on the left or right side of the presser foot 1, and the cloth on the needle plate 3 appears the feeding stretch condition.

[0046] When the sewing machine sews the cloth which is easy to wrinkle, after the feeding tooth 4 completes a feeding action, the displacement of the cloth at the presser foot accommodating groove 101 on the needle plate 3 is greater than the displacement of the cloth in front of the presser foot 1, and the cloth on the needle plate 3 appears the feeding wrinkle condition.

[0047] The above only describes the preferred embodiments of the present application, and it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A sewing machine fabric feed flatness detection system, the sewing machine comprising a presser foot (1), a needle (2), a needle plate (3), and a feed dog (4), characterized in that: The sewing machine fabric feeding flatness detection system includes a first vision sensor, a second vision sensor (5), and a control system. The first vision sensor is positioned above the presser foot thread groove (101) and away from the needle (2), and is used to detect the amount of fabric displacement at the presser foot thread groove (101) on the needle plate (3) after each feeding action of the feed dog (4). The second vision sensor (5) is positioned above the left or right side of the presser foot (1), and is used to detect the amount of fabric displacement on the left or right side of the presser foot (1) on the needle plate (3) after each feeding action of the feed dog (4). Both the first vision sensor and the second vision sensor (5) are communicatively connected to the signal input terminal of the control system.

2. The sewing machine fabric feeding flatness detection system according to claim 1, characterized in that: It also includes a third vision sensor (6), which is arranged above the front side of the presser foot (1) and is used to detect the displacement of the fabric on the front side of the presser foot (1) on the needle plate (3) after each feeding action of the feed tooth (4), wherein the front side of the presser foot (1) is the forward direction of the fabric; the third vision sensor (6) is communicatively connected to the signal input terminal of the control system.

3. The sewing machine fabric feeding flatness detection system according to claim 2, characterized in that: There are multiple first vision sensors, second vision sensors (5) and third vision sensors (6). Some of the second vision sensors (5) are located on the upper left side of the presser foot (1), and the rest of the second vision sensors (5) are located on the upper right side of the presser foot (1).

4. The sewing machine fabric feeding flatness detection system according to claim 3, characterized in that: Some of the second vision sensors (5) are arranged at equal intervals from front to back on the upper left side of the presser foot (1), while the rest of the second vision sensors (5) are arranged at equal intervals from front to back on the upper right side of the presser foot (1).

5. The sewing machine fabric feeding flatness detection system according to claim 3, characterized in that: The number of second vision sensors (5) located on the upper left side of the presser foot (1) is equal to the number of second vision sensors (5) located on the upper right side of the presser foot (1).

6. The sewing machine fabric feeding flatness detection system according to claim 3, characterized in that: Multiple third vision sensors (6) are arranged at equal intervals from left to right on the front upper side of the presser foot (1).

7. The sewing machine fabric feeding flatness detection system according to claim 2, characterized in that: For a flat sewing machine, the first vision sensor, the second vision sensor (5) and the third vision sensor (6) are all arranged at the corresponding positions of the cantilever chin of the machine head.

8. The sewing machine fabric feeding flatness detection system according to claim 7, characterized in that: The first vision sensor, the second vision sensor (5) and the third vision sensor (6) are all arranged at the corresponding positions at the bottom of the slit switch assembly (7) of the cantilever chin of the machine head.

9. A sewing machine fabric feeding flatness detection system according to claim 2, characterized in that: The communication connection is an electrical connection.

10. A sewing machine, characterized in that: Includes the sewing machine fabric feed flatness detection system as described in any one of claims 1-9.

Images